Double-acting plunger pump



Nov. 13. 1928.

B. MILLER DOUBLE ACTING PLUNGER PUMP INVENTOR.

Filed Se t. 28, 1927 Fig.2

Patented Nov. 13, 1928.

PAT

ENT. "OFFICE.

BENJAMIN MILLER, or nos ANen' ns, CALIFORNIA, ASSIGNOR 0F ONE-HALF To JESSE ARVEL com, or VAN NUYS, CALIFORNIA. 1

noUBLn-Ao'rmo PLUNGER PUMP.

Application filed September This invention relates to a double acting plunger pump in which the piston cylinder of the pump is inclosed within an external casing suiliciently large to provide an annular chamber between the outside of the piston cylinder and the inner surface of said external casing, the operation of the pump being such as to alternately elevate the liquid within said annular space and within the upper portion of said pi ton cylinder, a conduit being provided which communicates with said -annular space and piston cylinder at the upper end to conduct a continuous stream of liquid from the pump.

fin-object of this invention is to improve upon pumps of this character with respect to compactness, simplicity of construction and economy of operation. A further object of the invention is to provide an improved means for assembling; and [maintaining in proper relation to each other the two cylindrical casings which inclose the operating parts of the pump.

Still other ob ects and advantages may hereinafter appear.

Referring to the accompanying drawings which illustrate'a preferred embod ment of the invention, Figure 1 is a longitudinal midsection of the working parts of the pump and of the casings which inclose these parts Figure 2 is a side elevation of the pump Figure 3 is a cross-section on line 3-3 of Figure 1; Figure 4c is a perspective viewof' one ofthe valve elements and the guiding meanscarried thereby. I i v Referring in detail to the drawings, within an external elongated casing 1 is supported a piston cylinder 2 by means of the lower closure head 4i and the upper closure head 3,

said heads being respectively provided with annular grooves 6 and 5 in which are seated the lower and. upper ends of said piston cylinder, and lock screws 8 which hold said lower and upper closure heads intact with said casing. y

At a point preferably midway between its ends, each side of said casing 1 is provided with an inlet port, consisting ofa short con duit 8-which communicates with the conduit chamber 7 through which the liquid has egress into the piston cylinder 2. Saidconduits 8 each preferably consist of a short open-ended cap screw. These cap screws are desirably screwed into place at diametrically 28, 1927. Serial No. 222,582.

opposite sides of the casing in such away that they assist in holding the external-leasing and the piston cylinder in proper relation to each other so thatan annular chamber 9 is provided between said casing and cylinder.

In close proximity to said cap screws 8 are llkewise positioned spacer screws 8 which are adapted to locate the piston cylinders in alignment with the casing 1 before the cap screws 8 are screwed inposition thus providing; a tight fit between the head of the screw 8 and the casing 1.

In addition to theport andconduit mentioned a plurality of ports 10 are provided near the upper closed end of the casing 1 and. corresponding ports 11 are provided near the opposite end of said casing.

. The pump is provided with an operating piston rod 15 and a connecting piston rod 16. Said piston rod 16 is providedwith two com posite hollow piston heads 17 and 18 one near each end of the piston cylinders 2. With these piston heads co-operate respectively the valve structures designated in a general Way as 19 and 20. The piston heads are fixed to rod 16 and thereby maintained in spaced re lation to each other as best shown in Fig. 1 of the drawings. 1 I

7 Referring in detail to the construction of the composite piston head 18, said head come prises a short piston sleeve 25 having at its lower end a relatively thick, internally prorality of upstanding; guide fingers 30.that I are fixed to a valve disk 31, said disk being by the spring); 27 yieldinglyheld in cont-act with sleeve 29, the lower end of said sleeve.

forminga seat for said valve disk31.

The upper end-of connecting sleeve 29 externally screw threaded and has screwed thereonto a flanged cap 35 which fits slidably within the piston cylinder 2. and forms the upper end of the composite piston head 18.

Said cap is provided with a plurality of continuously open ports 36 and has also an annular lug 37 at its center into which is screwed the lower end of the connecting piston rod 16. Around the connecting sleeve 29 are proton cylinders 2 is the same that of the pisston head which hasjustbeen described and hence its parts are designated by the same reference characters; The piston head 17 is, however, arranged to force the liquid in the reverse direction with respect to the plunger cylinder 2.

Referring now to the valve construction 20, the piston cylinder 2 is formed in two sections which are united by external coupling sleeve 45. The end portions ofsaid coupling sleeve are internally threaded fora considerable distance and intoeach of these threaded .portions apertured valve seats 46 are screwed down as far as possible. Each of said valve seats consists of a relatively thick disk having acentral bore to receivethe connecting piston rod 16 and a stufling box 47 through which said rod plays, said stuffing boxes being directed toward each. other. The central inlet conduits 8 arelocated between these disks a6. Upon the outer faces of these disks 416 are seated-the movable valve disks 4L8, the latter disks being of less diameter than the internal diameter of coupling sleeve but of sulficient diameter to cover the disk apertures 49. They are yieldingly held in position'by a helical spring 27 tensioned between said valve disk a6 and a spring seat 50 screwed into the external Coupling sleeve 45.

Operation.

It is necessary to give the pump a few strokes in order to prime it, after which it 1S double acting, discharging with the down stroke as well as the up stroke. 7

The upper and lower composite piston heads, being connected together with a con-- necting rod properly spaced and working through two packing glands.

The object of the packing glands being to,

prevent leakage back into the well after the pump has been primed and under working pressure.

\Vhile the upper composite piston head is on the up stroke discharging its load the vacuum created below the piston head causes the upper foot valve disk to open and fill the chamber below the piston head for the next discharge.

Along with this action, the valve disk in the lower piston head is open, allowng water to pass through into the chamber below the lower piston head, the lower foot valve disk being closed. f

As. soon as the upper piston head has reached top center of its stroke and starts down, the upper foot valve disk closes and the valve disk in the upper piston head opens, allowing the piston head. to pass down through the liquid in t is chamber held there by the upper foot valve disk in closed position.

Simultaneously with this action the lower piston head having reached i as top cent *2, the valve disk in the piston head closes. The' piston head now being on the down stroke, the flaps of the packing washers being turned down, forces the liquid down through the port holes in the'lower end of piston chamber and upward through the an nular chamber and through another setof port holes in the upper piston chamber and out through the upper closure head. p

The vacuum created above the lower piston head causes the lower foot valve disk which is above the lower piston head to open allowing liquid toenter the pistonchamber and loading it'for the next discharge. As soon as lower piston head has reached bottom center and starts up, the lower foot valve disk closes and the valve disk in lower piston head opens on the. up stroke allowing liquid to pass 7 through into the chamberbelow the lower piston head, wiile simultaneous with this same up stroke the upper piston head is discharging another load, and vice versa throughout the operation of the pump.

Having thus traced the action of the pump through its cycle of operation, we find a double acting discharge with a single action stroke. V

In this specification and the accompanying drawings, I have described and shown a pre ferred form of my invention and have'specifically mentioned certain of its' more i.m-' portant objects.

I do not wish to limit myself to the forms disclosed since various changes and adaptations may be made therein withoutdeparting from theessence of my invention as hereinafter claimed, and objects and advantages other than those specifically mentionedare included within its scope. Y I

I claim: 7 a

1. In a pump, a casing having a double Wall providing an annular chamber closed at both ends, the inner wall of said chamber being formed by a pair of complementary piston cylinders, united with a coupling sleeve, the opposite ends of which are contained in the ends enclosing said annular chamber, there being ports through said'inner wall near each end thereof, an apertur'ed valve seat screwed into the ends of said coupling sleeve forming a conduit chamber, means near the mid-length of said annular chamber for conducting fluid there across to the interior of said conduit chamber, a spring seat screwed into said coupling sleeve inspaced relation with said apertured valve seats, a valve disk to close the apertures in said valve seat, a spring to seat upon said spring seat, to oppose the opening of said valve disks, pistons within said piston cylin-- ders, valves in said pistons, said valves cooperating with said valve disks in controlling the longitudinal flow of liquid flowing within said piston cylinders, through said ports into said annular chamber, an outlet conduit at one end of said piston cylinder and operating means for said pistons, said valves and pistons being adapted to alternately deliver fluid through said outlet conduit of said piston cylinder during the simul- I taneous reciprocation of said pistons.

' 2. In a pump, an upr1ght external casing having a closed lower end and an inlet through its side at a distance from said closed end, a piston cylinder within said external helical spring to seat upon said spring seat to oppose the opening of said valve disks, a lower piston head below one of said valve structures,-an upper piston head above the other of said valve structures, means for reciprocating said upper piston head, and a connecting rod connecting said upper piston head with said lower piston head, said connecting rod bein ournalled in each apertured valve 7 seat of a ove said valve structures, there being a port through the wall of the lower p0r-- t-ion of said piston cylinder and a port through the wall of the upper portion thereof.

8. In a casing construction for pumps, an external cylindrical caslng having a closure cap at each end, one of said caps having a cen- V tral passage therethrough and an annular groove in its inner face around said passage and the inner face of the other closures cap having a corresponding annular groove, :1 piston chamber composed of complementary piston cylinders, said complementary piston.

cylinders each having one of their ends seated in one of said grooves, a coupling sleeve connecting the other end of said complementary piston cylinders whereby to form aforesaid piston chamber, 'apertured valve seats screwed into said coupling sleeve and forming a conduit chamber, a conduit communicating with said conduit chamber through which liquid has egress into said piston chamber, movable valve disks seated upon said apertured valve seats, a spring seat screwed into aforesaid coupling sleeve in spaced relation with said apertured valve disks, said spring seats abutting against the exposed ends of aforesaid complementary piston cylinders, means supported by said spring seats to yieldably hold said movable valve disks in closed position, ports contained in the walls of said piston cylinder to afford communication between them and the annular chamber surrounding the same, a piston head contained within each of said piston cylinders, operating means connecting the same, valves in said piston heads said valves co-operating with said valve disks in controlling the longitudinal flow of liquid within said piston cylinders through saidv ports, and through said central passage in one of aforesaid closure ca s.

BENJA IN MILLER. 

